diff --git a/Lake/Build.lean b/Lake/Build.lean
index f90283186e..69b98bfd26 100644
--- a/Lake/Build.lean
+++ b/Lake/Build.lean
@@ -172,7 +172,7 @@ def Package.buildTargetWithDepTargetsFor
 (mod : Name) (depTargets : List PackageTarget) (self : Package)
 : IO PackageTarget := do
   let depsTarget ← LeanTarget.all <|
-    self.moreDepsTarget.withArtifact arbitrary :: depTargets
+    (← self.buildMoreDepsTarget).withArtifact arbitrary :: depTargets
   let oLeanDirs := depTargets.map (·.package.oleanDir)
   let (target, targetMap) ← self.buildModuleTargetDAGFor mod oLeanDirs depsTarget
   return {target with artifact := ⟨self, targetMap⟩}
@@ -219,7 +219,7 @@ def Package.buildModuleTargetsWithDeps
 : IO (List ModuleTarget) := do
   let oleanDirs := deps.map (·.oleanDir)
   let depsTarget ← LeanTarget.all <|
-    self.moreDepsTarget.withArtifact arbitrary :: (← deps.mapM (·.buildTarget))
+    (← self.buildMoreDepsTarget).withArtifact arbitrary :: (← deps.mapM (·.buildTarget))
   self.buildModuleTargets mods oleanDirs depsTarget
 
 def Package.buildModulesWithDeps
diff --git a/Lake/Package.lean b/Lake/Package.lean
index 8cb9345cac..e05435a9a7 100644
--- a/Lake/Package.lean
+++ b/Lake/Package.lean
@@ -49,7 +49,7 @@ structure PackageConfig where
   libName : String := moduleRoot.toString (escape := false)
   depsDir : FilePath := defaultDepsDir
   dependencies : List Dependency := []
-  moreDepsTarget : BuildTarget LeanTrace PUnit := BuildTarget.nil
+  buildMoreDepsTarget : IO (BuildTarget LeanTrace PUnit) := BuildTarget.nil
   scripts : HashMap String Script := HashMap.empty
   deriving Inhabited
 
@@ -83,8 +83,8 @@ def moduleRootName (self : Package) : String :=
 def dependencies (self : Package) : List Dependency :=
   self.config.dependencies
 
-def moreDepsTarget (self : Package) : BuildTarget LeanTrace PUnit :=
-  self.config.moreDepsTarget
+def buildMoreDepsTarget (self : Package) : IO (BuildTarget LeanTrace PUnit) :=
+  self.config.buildMoreDepsTarget
 
 def leanArgs (self : Package) : Array String :=
   self.config.leanArgs